> ---------- Forwarded message ----------
> From: Paolo Pr <[email protected]>
> To: lilypond-user <[email protected]>
> Cc:
> Bcc:
> Date: Thu, 12 Dec 2019 17:52:58 +0100
> Subject: A Javascript test code for modifying ties and slurs with mouse
> I just created a javascript script to change the slurs of the .svg file
> produced by Lilypond using the mouse, as I had announced. The coordinates
> of the control points of the associated Bezier curve can be reported in the
> corresponding .ly file and this completely avoids the time consuming trial
> and error process we were talking about. The script is 100% Javascript
> native, without any additional library and I tried it on the Firefox and
> Chromium browsers. Let's see how it works.
>
> 1) Create a score using the template that shows the control points,
> implemented by Aaron (please, re-indent it); I added a small change to set
> some attributes on the generated svg tags:
>
> http://lilybin.com/29lnbd/4
>
> 2) Generate with Lilypond the .svg file and add to it the Javascript
> script implemented by me. To test everything, let's use JsFiddle:
>
> https://jsfiddle.net/61pb9Le4/
>
> My script is in the lower left pane; in the upper left pane I pasted the
> .svg file generated by Lilypond. Note that, to make the script work, if you
> create a new JsFiddle, you need to select "LOAD TYPE" option = "No wrap -
> bottom of <body>".
>
> 3) Modify the slurs by moving the control points with the mouse
>
> 4) The coordinates of the modified slur can be displayed by right-clicking
> on one of the slur's control points. A string will appear in the form:
>
> "shape # '((x1. y1) (x2. y2) (x1. y1) (x3. y3) (x4. y4)) PhrasingSlur"
>
> or
>
> "shape # '((x1. y1) (x2. y2) (x1. y1) (x3. y3) (x4. y4)) Slur"
>
> or
>
> "shape # '((x1. y1) (x2. y2) (x1. y1) (x3. y3) (x4. y4)) Tie"
>
> This string must be copied to the .ly file, near the slur to be modified.
>
> .....................
>
> I wrote all this really in a hurry, and the code needs to be improved at
> various points. But the first tests seem to work. Now I'm trying to figure
> out what is the best (and portable) way to automatically include the
> Javascript script in the .svg file generated by Lilypond ...
>
> HTH
> P
>
This is fantastic!
I often leave mediocre slurs and ties as is, just because wrangling them in
code is a pain. This will make it much more likely that I'll have the
bandwidth to improve them.
This may help folks who want to try this out, here is how I understand the
intended approach and how I was able to reproduce it locally.
1) Prepare the score for control point tweaking
Include in your lilypond files this new definition
showControlPoints = #(grob-transformer 'stencil (lambda (grob orig)
...
As well as this layout context
\layout {
\context {
\Voice
\override PhrasingSlur.stencil = #showControlPoints
\override PhrasingSlur.output-attributes = #'((class . "lilySlur")(slurtype
. "PhrasingSlur"))
\override Slur.stencil = #showControlPoints
\override Slur.output-attributes = #'((class . "lilySlur")(slurtype .
"Slur"))
\override Tie.stencil = #showControlPoints
\override Tie.output-attributes = #'((class . "lilySlur")(slurtype .
"Tie"))
}
}
2) Create the SVG version.
run lilypond with the option -dbackend=svg
3) Create an HTML page that allows editing
Save the JavaScript code in a file, such as show-control-points.js.
Create an HTML document like this:
<html>
<head><title>Editing Lilypond curves</title>
</head>
<body>
<svg...>...</svg>
<script src="show-control-points.js"></script>
</body>
</html>
I tried to figure out how to include the SVG file by reference, but either
using <img src=""> or <object src="">. But that did not work, since it
would produce objects that do not have width or height attributes
accessible via JavaScript. Seems like the SVG has to be inline in the HTML
document for this approach to work.
In terms of workflow, I would probably create this HTML document subsequent
to creating the SVG using a script:
#!/usr/local/bin/bash
# Usage: create-html-for-svg.sh svgFileName htmlFileName
SVG=$1
HTML=$1
echo "<html>" > $HTML
echo "<head><title>Editing Lilypond curves</title>" >> $HTML
echo "</head>" >> $HTML
echo "<body>" >> $HTML
echo "" >> $HTML
cat $SVG >> $HTML
echo "" >> $HTML
echo "<script src="edit-control-points.js"></script>" >> $HTML
echo "</body>" >> $HTML
echo "</html>" >> $HTML
echo "" >> $HTML
Then invoke it like:
$ create-html-for-svg.sh example.svg edit-curves.html
4) Open HTML page in a browser and edit curves
move the points around, right click to get the \shape definition,
5) Update lilypond source
For each curve you modify, apply that shape modification in your lilyond
source.
To generate the final document, remove the \layout section that we added in
step 1.
Thanks,
Elaine Alt
415 . 341 .4954 "*Confusion is
highly underrated*"
[email protected]
Producer ~ Composer ~ Instrumentalist ~ Educator
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
